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Castellanos, Santa Lucia, Matahambre, Esperanza |
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Cuba |
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Zn Pb Ag
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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Castellanos is one of a number of shale hosted massive sulphide deposits located in north-western Cuba.
These deposits are hosted by the 3000 m thick Jurassic San Cayetano Formation, a terriginous assemblage of feldspathic sandstones, siltstones and argillites with black shale lenses and dolomite beds. In addition several bedded, but non-sulphide, barite deposits occur to the south-west. All of the Zn-Pb deposits are stratabound and are hosted by black shales which occur as thick lenses enclosed by quartzofeldspathic sandstones and silts.
The principal structure comprises an antiform, truncated by the north-west to south-east directed regional Viñales overthrust which emplaced a complex faulted mixture of Jurassic limestone and chaotic heterolithic tectonic melange breccias of various volcanics and serpentinised ophiolites in a silty matrix onto the sediments of the San Cayetano Formation.
The main deposits include:
Castellanos - which comprises a 700 m long stratabound lens that is 4.6 to 76 m thick and extends down dip for a maximum of 300 m. It is composed of pyrite, sphalerite and galena in a hydrothermal quartz-carbonate-barite matrix, with very little associated internal shale or clastics. The fabric of the massive sulphides vary from massive, to banded to brecciated. The north-eastern end of the deposit overlies a transgressive copper stringer zone, where the basal part of the massive sulphide is composed exclusively of dolomite. It has reserves of some 12 Mt @ 2.4% Zn, 3.2% Pb, 43 g/t Ag, 7.9% Ba
Santa Lucia - is a 19.6 Mt bedded Zn-Pb-Ba occurrence that is not underlain by a transgressive chalcopyrite stringer zone.
Matahambre - essentially a Cu deposit with mined production and reserves totalling around 13 Mt of massive chalcopyrite and pyrite, overlain by a small (1.8 Mt) stratiform lense of Zn-Pb mineralisation and underlain by a 0.5 Mt zone of crosscutting chalcopyrite stringers.
Esperanza - is a 2.5 Mt chalcopyrite stringer zone without associated chalcopyrite.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1995.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Whitehead R E, Davies J F, Valdes-Nodarse E L, Diaz-Carmona A 1996 - Mineralogical and chemical variations, Castellanos shale-hosted Zn-Pb-Ba deposit, northwestern Cuba: in Econ. Geol. v91 pp 713-722
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